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Forty study participants reacted to the vaccine, and 69 participants did not.[ref] Smallpox vaccines have not been used on the general public in the US in over 47 years, and none of the study participants had previously received a smallpox vaccine.[ref] Read why the author of that smallpox vaccine study does NOT think it shows a reason not to vaccinate

Nykjaer, A., Fyfe, J

References Levine M, Padayatty SJ

Benefits of Vitamin B12 Injections Risks and Side Effects Get Your Vitamin B12 Needs with a Neuro Booster Injection at Home via Halodoc Vitamin B12 is an essential nutrient that plays a vital role in many of the bodys key functions, including red blood cell production, nerve health, and energy metabolism